TST: Replace ensure_clean_store with tmp_path in tests/io/pytables/te…

[johnff9]

Replace ensure_clean_store with tmp_path in test_keys.py

In this PR, there are changes to the test file pandas/tests/io/pytables/test_keys.py removing ensure_clean_store and instead using a tmp_path.

All tests pass:
4 passed in 0.14s

Related Issue:
#62435

[johnff9]

@fangchenli

[fangchenli]

Don't forget to keep this sync with main:

git fetch upstream
git merge upstream/main

See this

[johnff9]

The merge of main after being synced has been completed. Thank you @fangchenli for helping me with some of the basics that I overlooked in my first contribution to open source